Phosphor-Free Inter-Element Resin for LED Color Uniformity
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Solution Overview
Problem
Densely disposed light emitting elements in existing light emitting devices often result in color unevenness due to the longer optical path in sealing members, which increases fluorescence emission between elements and worsens as the spacing between elements decreases.
Innovation Solution
A light emitting device with a transparent resin embedded between the elements and a phosphor-containing resin layer on top, where the phosphor-free transparent resin has regions of different fluorescent colors distributed in a checkered pattern, reducing the optical path length and minimizing color unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light emitting elements are densely disposed to increase device integration, then device productivity and area utilization are improved, but color unevenness worsens due to longer optical paths in sealing members increasing fluorescence emission between elements
Solution Approach 1:
The patent extracts the phosphor material from the transparent resin that fills the space between light emitting elements. By removing phosphor from the inter-element spacing material, the harmful fluorescence emission is eliminated while maintaining the structural function of filling gaps and supporting elements.
Solution Approach 2:
The patent applies different material compositions to different regions: phosphor-free transparent resin is used specifically in the spaces between light emitting elements where fluorescence would cause color unevenness, while phosphor-containing resin is used in other regions for light conversion. This localized material differentiation solves the color uniformity problem in high-density configurations.
2Area of stationary object
If the space between light emitting elements is reduced to increase density, then device area is reduced, but color unevenness increases due to enhanced fluorescence emission from the sealing member
Solution Approach 1:
By extracting phosphor from the transparent resin used in inter-element spacing, the patent eliminates the source of harmful fluorescence that would otherwise be amplified in reduced spacing configurations, enabling high-density layouts without compromising color uniformity.
Solution Approach 2:
The patent changes the compositional parameter of the transparent resin by removing phosphor content, which fundamentally alters the optical properties of the material in the inter-element region, preventing fluorescence emission even when optical path lengths are reduced due to smaller spacing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces color unevenness even at high density light emitting element arrangements, particularly when the spacing between elements is small, by controlling light emission and absorption, and enhancing light extraction efficiency.
Implementation Method 1
a phosphor containing resin layer formed on the plurality of light emitting elements and the transparent resin
Data Source
AI summary
A light emitting device includes a substrate, a plurality of light emitting elements disposed on the substrate, a transparent resin embedded in a space between the plurality of light emitting elements, and a phosphor containing resin layer formed on the plurality of light emitting elements and the transparent resin. The transparent resin includes no phosphor.